Commit | Line | Data |
---|---|---|
1da177e4 LT |
1 | /* |
2 | * linux/arch/x86_64/kernel/irq.c | |
3 | * | |
4 | * Copyright (C) 1992, 1998 Linus Torvalds, Ingo Molnar | |
5 | * | |
6 | * This file contains the lowest level x86_64-specific interrupt | |
7 | * entry and irq statistics code. All the remaining irq logic is | |
8 | * done by the generic kernel/irq/ code and in the | |
9 | * x86_64-specific irq controller code. (e.g. i8259.c and | |
10 | * io_apic.c.) | |
11 | */ | |
12 | ||
13 | #include <linux/kernel_stat.h> | |
14 | #include <linux/interrupt.h> | |
15 | #include <linux/seq_file.h> | |
16 | #include <linux/module.h> | |
76e4f660 | 17 | #include <linux/delay.h> |
1da177e4 LT |
18 | #include <asm/uaccess.h> |
19 | #include <asm/io_apic.h> | |
20 | ||
21 | atomic_t irq_err_count; | |
22 | #ifdef CONFIG_X86_IO_APIC | |
23 | #ifdef APIC_MISMATCH_DEBUG | |
24 | atomic_t irq_mis_count; | |
25 | #endif | |
26 | #endif | |
27 | ||
28 | /* | |
29 | * Generic, controller-independent functions: | |
30 | */ | |
31 | ||
32 | int show_interrupts(struct seq_file *p, void *v) | |
33 | { | |
34 | int i = *(loff_t *) v, j; | |
35 | struct irqaction * action; | |
36 | unsigned long flags; | |
37 | ||
38 | if (i == 0) { | |
39 | seq_printf(p, " "); | |
40 | for (j=0; j<NR_CPUS; j++) | |
41 | if (cpu_online(j)) | |
42 | seq_printf(p, "CPU%d ",j); | |
43 | seq_putc(p, '\n'); | |
44 | } | |
45 | ||
46 | if (i < NR_IRQS) { | |
47 | spin_lock_irqsave(&irq_desc[i].lock, flags); | |
48 | action = irq_desc[i].action; | |
49 | if (!action) | |
50 | goto skip; | |
51 | seq_printf(p, "%3d: ",i); | |
52 | #ifndef CONFIG_SMP | |
53 | seq_printf(p, "%10u ", kstat_irqs(i)); | |
54 | #else | |
55 | for (j=0; j<NR_CPUS; j++) | |
56 | if (cpu_online(j)) | |
57 | seq_printf(p, "%10u ", | |
58 | kstat_cpu(j).irqs[i]); | |
59 | #endif | |
60 | seq_printf(p, " %14s", irq_desc[i].handler->typename); | |
61 | ||
62 | seq_printf(p, " %s", action->name); | |
63 | for (action=action->next; action; action = action->next) | |
64 | seq_printf(p, ", %s", action->name); | |
65 | seq_putc(p, '\n'); | |
66 | skip: | |
67 | spin_unlock_irqrestore(&irq_desc[i].lock, flags); | |
68 | } else if (i == NR_IRQS) { | |
69 | seq_printf(p, "NMI: "); | |
70 | for (j = 0; j < NR_CPUS; j++) | |
71 | if (cpu_online(j)) | |
72 | seq_printf(p, "%10u ", cpu_pda[j].__nmi_count); | |
73 | seq_putc(p, '\n'); | |
74 | #ifdef CONFIG_X86_LOCAL_APIC | |
75 | seq_printf(p, "LOC: "); | |
76 | for (j = 0; j < NR_CPUS; j++) | |
77 | if (cpu_online(j)) | |
78 | seq_printf(p, "%10u ", cpu_pda[j].apic_timer_irqs); | |
79 | seq_putc(p, '\n'); | |
80 | #endif | |
81 | seq_printf(p, "ERR: %10u\n", atomic_read(&irq_err_count)); | |
82 | #ifdef CONFIG_X86_IO_APIC | |
83 | #ifdef APIC_MISMATCH_DEBUG | |
84 | seq_printf(p, "MIS: %10u\n", atomic_read(&irq_mis_count)); | |
85 | #endif | |
86 | #endif | |
87 | } | |
88 | return 0; | |
89 | } | |
90 | ||
91 | /* | |
92 | * do_IRQ handles all normal device IRQ's (the special | |
93 | * SMP cross-CPU interrupts have their own specific | |
94 | * handlers). | |
95 | */ | |
96 | asmlinkage unsigned int do_IRQ(struct pt_regs *regs) | |
97 | { | |
98 | /* high bits used in ret_from_ code */ | |
99 | unsigned irq = regs->orig_rax & 0xff; | |
100 | ||
101 | irq_enter(); | |
102 | BUG_ON(irq > 256); | |
103 | ||
104 | __do_IRQ(irq, regs); | |
105 | irq_exit(); | |
106 | ||
107 | return 1; | |
108 | } | |
109 | ||
76e4f660 AR |
110 | #ifdef CONFIG_HOTPLUG_CPU |
111 | void fixup_irqs(cpumask_t map) | |
112 | { | |
113 | unsigned int irq; | |
114 | static int warned; | |
115 | ||
116 | for (irq = 0; irq < NR_IRQS; irq++) { | |
117 | cpumask_t mask; | |
118 | if (irq == 2) | |
119 | continue; | |
120 | ||
121 | cpus_and(mask, irq_affinity[irq], map); | |
122 | if (any_online_cpu(mask) == NR_CPUS) { | |
123 | printk("Breaking affinity for irq %i\n", irq); | |
124 | mask = map; | |
125 | } | |
126 | if (irq_desc[irq].handler->set_affinity) | |
127 | irq_desc[irq].handler->set_affinity(irq, mask); | |
128 | else if (irq_desc[irq].action && !(warned++)) | |
129 | printk("Cannot set affinity for irq %i\n", irq); | |
130 | } | |
131 | ||
132 | /* That doesn't seem sufficient. Give it 1ms. */ | |
133 | local_irq_enable(); | |
134 | mdelay(1); | |
135 | local_irq_disable(); | |
136 | } | |
137 | #endif | |
ed6b676c AK |
138 | |
139 | extern void call_softirq(void); | |
140 | ||
141 | asmlinkage void do_softirq(void) | |
142 | { | |
143 | __u32 pending; | |
144 | unsigned long flags; | |
145 | ||
146 | if (in_interrupt()) | |
147 | return; | |
148 | ||
149 | local_irq_save(flags); | |
150 | pending = local_softirq_pending(); | |
151 | /* Switch to interrupt stack */ | |
152 | if (pending) | |
153 | call_softirq(); | |
154 | local_irq_restore(flags); | |
155 | } | |
156 | EXPORT_SYMBOL(do_softirq); |